Childhood leukemia is a common childhood blood disease, mainly caused by the failure of the normal production of metabolism of whole blood cells. Causes of childhood leukemia are mainly the following: 1, environmental pollution: the living environment must pay more attention, especially environmental pollution, more attention should be paid. Newly renovated house at home, must be ventilated and breathable, breathable for a long time, once you ignore the breathable, can cause benzene exceeds the standard, formaldehyde exceeds the standard. These substances, can cause hematopoietic stem cell genetic mutation, causing leukemia. 2, genetic: leukemia may be caused by genetics, due to chromosome breaks, ectopic proto-oncogene mutations and other reasons. In the case of identical twins, one of them has leukemia, and the other has a probability of developing about 20%. 3, viral infection: viruses should not be ignored, especially T-lymphocytes, which can easily cause infection and can cause lymphocytic leukemia. At the same time, RNA virus reversal occurs, which can also cause leukemia. 4, radioactive substances: repeated occurrences of radioactive radiation, can also cause leukemia. Mainly because the bone marrow is suppressed and the immunity of the body is reduced.